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are watching live from singapore and london. still to come, safeguarding one of afghanistan's architectural treasures. that battle to preserve this historic city. >> and blended kickstart the final race to the finish line to the olympics. and independent inquiry has found that one in 10 experiments on monkeys has no clear sign to the purpose. studies involving monkeys have led to important benefits over the years, such as the development of a polio vaccine and treatment for strokes and parkinson's disease. an animal welfare groups describe the inquiry's findings as chilling. >> it is done in cases where we believe it will yield fantastic results that meat -- that may either now or sometime in the future be important for human health. >> but is all the research carried out really necessary? and does it always lead to a scientific and medical benefits? according to a review of research on monkeys, on the whole, the work is of high quality and were continuing, but there were some concerns. -- worth continuing, but there were some concerns. >> some of the work does not justify continuing in ter
to general petraeus on his way home from afghanistan about america's longest war and other matters. >> nato forces in afghanistan have a new commander. general david petraeus is on the way home. he had been expected to serve longer but has been recalled to head the cia. the force he is leaving behind is now being quicker than he recommended. the insurgency has shown itself capable of hitting back with the assassinations and spectacular attacks. nato insists that they're winning. i asked the general what the possible grounds for optimism could be. >> what we have seen now is developing into a trend. in fact, this past week, yet again the level of insurgent attacks was lower, over 20% lower than the level of attacks in the same week last year. that makes nine of the last 13 weeks in which this has taken place in which the levels of attacks are lower than the corresponding time last year. that is completely contrary to what the intelligence professionals predicted. >> do you think that the strategic level, the death of bin laden, has created any new political possibilities or check political m
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